Wreck of the Alert

Wreck of the Alert Dive Site Guide | Phillip Island, VIC, Australia

By ScubaDownUnder Team · 2026-03-18

Iron frames lie scattered across a kelp-covered reef, half-swallowed by ecklonia and encrusted with the orange and red growth of a Bass Strait temperate reef. A southern blue devil flashes out of a gap between broken plates, holds territorial position for a moment, and retreats into the iron. The light overhead is the filtered green of a Victorian kelp forest in full canopy, dim and shifting with the surge. The Alert has been part of this reef for more than 130 years, and the distinction between shipwreck and reef has quietly dissolved over those decades. What remains is a productive patch of temperate habitat with iron bones, and a dive that asks divers to earn their encounters with weather, entry, and patience.

The Alert was an iron-hulled sailing vessel that came to grief on the Phillip Island coast during a storm in August 1893, carrying general cargo. The crew survived, the cargo was lost, and the ship broke up on the rocks and gradually dispersed across the reef system over successive decades of swell and scour. Phillip Island lies within the traditional country of the Bunurong people, on the eastern approach to Western Port and the western boundary of Bass Strait. The island's southern and eastern coastlines have collected several vessels over the course of colonial shipping history, and the remains of these ships now form part of the island's underwater archaeology. Heritage Victoria maintains the shipwreck register under which the Alert is recorded.

The dive begins with a rock-and-boulder entry from the coast near Cape Woolamai, typically via a ledge or gully that provides manageable access to the water depending on the prevailing swell. This is not a step-in entry, and it is not appropriate for divers who are not comfortable with physical entry across uneven terrain or who lack confidence in the surface conditions of the day. Once in the water, the kelp forest is immediately present, the ecklonia canopy reducing the light above and the water column holding the quiet, filtered green of temperate reef diving in Victoria. The wreck itself lies in 4 to 14 metres of water, and navigation to the debris requires local knowledge or a guide. The iron does not announce itself from any distance, and the kelp obscures the identifying features until the diver is close enough to see specific structural detail. Boiler sections, plating, frames, and miscellaneous iron are scattered across the rocky bottom, the entire wreck site colonised by kelp and the encrusting temperate marine community of Bass Strait.

Southern blue devil fish (*Paraplesiops meleagris*) are the immediate signature residents of the wreck site. Vivid blue and white and territorial in disposition, they occupy the gaps and crevices of the iron structure and are reliably present on most dives. They are a southern Australian endemic found in the cooler waters of the continent's southern coast, and the Phillip Island population is well-established at this site. Weedy sea dragons drift through the kelp at the edges of the wreck, most reliably seen through spring and early summer. Giant cuttlefish appear in winter and spring during the breeding aggregation, though not in the numbers seen at South Australian sites. Southern rock lobster hold position in the deeper gaps under plating. The iron plates and frames carry a community of nudibranchs, seastars, encrusting sponges, and small reef fish that rewards methodical search. Hornfish, old wives, leatherjackets, and schools of bullseyes populate the mid-water zone. Australian fur seals occasionally pass through from the colonies on the Bass Strait islands, and their presence is a wildcard addition rather than a reliable feature.

Visibility at the Alert is the primary variable that determines dive quality. On a calm summer day with settled conditions and minimal swell, 8 to 10 metres is achievable, and the wreck site can be systematically explored across a single dive. Following storms, visibility can drop to 2 or 3 metres and the surge against the iron debris creates a meaningful entanglement and laceration risk. The dive is not appropriate in anything other than settled conditions, and Bass Strait's weather patterns mean that settled windows can be short-lived, particularly from May through October. Water temperature at Phillip Island ranges from about 11 degrees Celsius in winter to 19 degrees in summer. A drysuit or a well-fitted 7mm wetsuit with hood and gloves is appropriate year-round. Cold water is a constant feature of Bass Strait diving, and the entry exertion combined with a longer dive profile means thermal management needs attention on every visit. Best season runs from November to April; the site is effectively unavailable in the winter storm season except in rare settled windows.

Repeat divers come back for the blue devils and for the reef community that has developed around the iron. The specific gaps and structural features that the blue devils favour can be memorised across visits, and a confident diver returning to the same pieces of plating often finds the same territorial individuals in the same positions. The kelp margins hold the dragons; the deeper fissures hold the lobster. Nudibranch photography rewards patience with the layered encrusting community on the less-exposed sections of the iron. A torch reveals the small invertebrate life tucked into the plate overlaps, and the occasional historical fragment, rivets, fittings, shards of ship's hardware, gives the wreck its archaeological character. The contrast between the iron structure and the living reef that has overtaken it is, over time, the most interesting aspect of the site.

The Alert is not a signature wreck dive in the way of the larger and more famous Victorian shipwrecks. It is a scattered, kelp-covered ruin on a Bass Strait reef, difficult to access on many days and modest in scale on the ones it permits. What it offers in exchange is a genuine piece of colonial shipping history slowly being absorbed into the living marine community, and the kind of temperate reef encounters, particularly with the southern blue devils, that define why Victorian diving rewards the cold and the effort.

## Site Access and Logistics

The Alert wreck is on the eastern coast of Phillip Island near Cape Woolamai, accessed via a walk across rocky terrain from limited parking at the nearest track access point. Conditions on the day determine which entry route is appropriate, and local operator knowledge is valuable for first-time visitors. Phillip Island is reached from Melbourne via the South Gippsland Highway and the bridge crossing at Newhaven, approximately 140km and 90 minutes by road. The nearest public facilities are at Cape Woolamai township. Intermediate diving experience is recommended; Open Water certified divers with limited post-certification experience should dive with a local operator familiar with the site and the entry conditions. A drysuit or 7mm wetsuit with hood and gloves is essential year-round. A torch, a cutting tool, and surface marker are recommended. Dive Gear Australia ([https://divegearaustralia.com.au](https://divegearaustralia.com.au)) services Phillip Island dive sites from a base that caters to divers across Melbourne, Phillip Island, Wilsons Promontory, and the Mornington Peninsula. Note that the site should be planned during settled weather windows only; Bass Strait swell and wind patterns make many days unsuitable.

## Sources

- Dive Gear Australia, [https://divegearaustralia.com.au](https://divegearaustralia.com.au) - Scuba Doctor, Phillip Island Wreck Dives, [https://www.scubadoctor.com.au/phillip-island-wreck-dives.htm](https://www.scubadoctor.com.au/phillip-island-wreck-dives.htm) - Heritage Victoria, Shipwreck register, [https://www.heritage.vic.gov.au/heritage-listings/maritime-heritage](https://www.heritage.vic.gov.au/heritage-listings/maritime-heritage) - Visit Bass Coast, Diving in Phillip Island and Western Port, [https://www.visitbasscoast.com.au/diving-in-phillip-island-and-the-western-port](https://www.visitbasscoast.com.au/diving-in-phillip-island-and-the-western-port) - Atlas of Living Australia, Southern blue devil (*Paraplesiops meleagris*) distribution